{"product_id":"alcon-pro-system-porsche-992-gt3-and-gt3-rs-rear-brake-kit","title":"Alcon\/Pro-System Porsche 992 GT3 and GT3 RS Rear Brake Kit","description":"\u003cp\u003eComplete the rear axle of your 992 GT3 and GT3 RS race build with Alcon four-piston calipers, 390x32mm floating rotors and Project Mu H21 pads. This is the rear assembly from Pro-System’s 390mm race package, with dedicated hats and brackets and a clearly defined service-parts specification.\u003c\/p\u003e\n\u003cp\u003eThe rear calipers weigh 5.3 lb each and use 31.8 \/ 34.9mm piston diameters. Paired with 18mm-thick Project Mu H21 pads and 390x32mm rotors, the package brings caliper, rotor and friction dimensions together in a dedicated race configuration.\u003c\/p\u003e\n\u003ch2\u003eAlcon Pro-System Porsche 992 GT3 and GT3 R Rear Race Brake Kit\u003c\/h2\u003e\n\u003cp\u003ePro-System draws on more than two decades of motorsport experience to assemble brake packages around Alcon calipers. The value lies in the complete application: rotors, hats, brackets, calipers, pads and mounting hardware chosen together. Dyno-bedded rotors and pads are part of that preparation, bringing the friction components together before installation.\u003c\/p\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAlcon four-piston rear competition calipers\u003c\/li\u003e\n\u003cli\u003e390x32mm floating two-piece rotors with 48 ventilation vanes\u003c\/li\u003e\n\u003cli\u003eDyno-bedded rotors and pads\u003c\/li\u003e\n\u003cli\u003ePrecision-machined aluminum hats and dedicated caliper brackets\u003c\/li\u003e\n\u003cli\u003eIndividually identified replacement rings, pads and mounting parts\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eAlcon Competition Calipers\u003c\/h3\u003e\n\u003cp\u003eThe four-piston layout and 31.8 \/ 34.9mm piston dimensions define this caliper assembly. Dedicated mounting brackets locate the calipers over the matching rotors, while the 18mm pad thickness provides the friction specification for the race package. Use the part references below when servicing the kit so that replacement pads and mounting components match the original configuration.\u003c\/p\u003e\n\u003ch3\u003eFloating Two-Piece Rotors\u003c\/h3\u003e\n\u003cp\u003eThe iron friction ring and aluminum hat operate at different temperatures during hard braking. A floating attachment allows the ring to expand as heat builds, reducing the restraint of a rigid connection. The two-piece construction also makes the kit practical to maintain: a worn rotor ring can be replaced while retaining a serviceable hat.\u003c\/p\u003e\n\u003ch3\u003eVentilation and Heat Management\u003c\/h3\u003e\n\u003cp\u003eThe 390x32mm rotor rings use 48 ventilation vanes to move air through the friction assembly and help carry away braking heat. Repeated braking places a sustained demand on this assembly, making rotor dimensions, ventilation and the floating attachment important parts of the overall specification. Separate left and right rotor references identify the correct ring for each side.\u003c\/p\u003e\n\u003ch3\u003eFitment and Installation\u003c\/h3\u003e\n\u003cp\u003eThis is the dedicated race specification, separate from the standard street\/track kit. Confirm wheel clearance for your exact wheels before ordering; wheel diameter alone does not establish caliper clearance. Follow the kit installation instructions and use a technician familiar with performance brake systems.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eKit part number: BRK.200621-Rear\u003c\/strong\u003e\u003c\/p\u003e\n\u003cstyle\u003e#pro-system-spare-parts{clear:both;max-width:100%;min-width:0;color:#27313c;font:15px\/1.55 system-ui,-apple-system,BlinkMacSystemFont,\"Segoe UI\",sans-serif}#pro-system-spare-parts h2{font-size:24px;line-height:1.25;margin:0 0 10px;font-weight:650}#pro-system-spare-parts h3{font-size:17px;line-height:1.35;margin:30px 0 12px;font-weight:650}#pro-system-spare-parts p{margin:0 0 18px;color:#5b6570}#pro-system-spare-parts .ps-table{border-collapse:collapse;width:100%;table-layout:fixed;margin:0 0 22px}#pro-system-spare-parts .ps-table th{font-size:12px;letter-spacing:.07em;text-transform:uppercase;text-align:left;color:#586576;font-weight:650;padding:10px 14px;border-bottom:2px solid #d6dce3}#pro-system-spare-parts .ps-table th:first-child{width:57%}#pro-system-spare-parts .ps-table th:last-child{width:43%}#pro-system-spare-parts .ps-table td{padding:15px 14px;border-bottom:1px solid #e5e9ed;vertical-align:top;overflow-wrap:anywhere;white-space:normal}#pro-system-spare-parts .ps-table tbody tr:nth-child(even){background:#f6f8fa}#pro-system-spare-parts .ps-part-label{font-weight:500}#pro-system-spare-parts .ps-sku{font-size:14px;color:#5b6570}#pro-system-spare-parts .ps-sku a{display:inline;color:#175b99;font-weight:600;text-decoration:underline;text-decoration-color:#b4c8df;text-underline-offset:4px}#pro-system-spare-parts .ps-sku a:hover{text-decoration-color:currentColor}#pro-system-spare-parts .ps-sku a:focus-visible{outline:2px solid #175b99;outline-offset:3px}@media(max-width:600px){#pro-system-spare-parts h2{font-size:22px}#pro-system-spare-parts h3{font-size:16px;margin-top:24px}#pro-system-spare-parts .ps-table,#pro-system-spare-parts .ps-table tbody,#pro-system-spare-parts .ps-table tr,#pro-system-spare-parts .ps-table td{display:block;width:100%;box-sizing:border-box}#pro-system-spare-parts .ps-table thead{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}#pro-system-spare-parts .ps-table tr{padding:13px 12px;border-bottom:1px solid #e3e8ed}#pro-system-spare-parts .ps-table td{padding:0;border:0}#pro-system-spare-parts .ps-table .ps-part-label{font-size:14px;margin-bottom:5px}#pro-system-spare-parts .ps-table .ps-sku{font-size:13px;line-height:1.8}}\u003c\/style\u003e\n\u003csection id=\"pro-system-spare-parts\"\u003e\n\u003ch2\u003eReplacement Parts for Your 992 GT3 and GT3 R Rear Race Kit\u003c\/h2\u003e\n\u003c\/section\u003e","brand":"Pro-System","offers":[{"title":"Project Mu H21 \/ Anodized","offer_id":49339524350260,"sku":"BRK.200592","price":5500.0,"currency_code":"USD","in_stock":true},{"title":"Project Mu H21 \/ Plated","offer_id":49339524612404,"sku":null,"price":5500.0,"currency_code":"USD","in_stock":true},{"title":"Pro-System B1 \/ Anodized","offer_id":49339524645172,"sku":null,"price":5500.0,"currency_code":"USD","in_stock":true},{"title":"Pro-System B1 \/ Plated","offer_id":49339524677940,"sku":null,"price":5500.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0820\/8534\/7636\/files\/gps_generated_7b954e59-27e6-4450-9e49-db512833f53f.png?v=1791899472","url":"https:\/\/alconkits.com\/products\/alcon-pro-system-porsche-992-gt3-and-gt3-rs-rear-brake-kit","provider":"Alcon Brake Kits","version":"1.0","type":"link"}